/Engine/Plugins/Runtime/XRBase/Source/XRBase/Public/HeadMountedDisplayFunctionLibrary.h
Returns the flags for the device, so scripts can modify their behaviour appropriately
IsAR, IsTablet, IsHeadMounted. Returns false
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintPure, Category="Input|HeadMountedDisplay") static int32 GetXRSystemFlags()